Weather Alerts for Alaska
1. Flood Advisory for: Southern Susitna Valley; Central Susitna Valley
2. Flood Advisory for: Upper Kobuk Valleys
3. Flood Advisory for: Western Susitna Valley; Central Susitna Valley
4. Flood Warning for: Lower Koyukuk Valley
5. Flood Warning for: Upper Koyukuk Valley
6. Flood Warning for: Western Susitna Valley; Southern Susitna Valley; Central Susitna Valley
7. Flood Watch for: South Slopes of the Western Brooks Range; Noatak Valley; Upper Kobuk Valleys; Lower Koyukuk Valley; Upper Koyukuk Valley
8. Hydrologic Outlook for: Fairbanks Metro Area
9. Hydrologic Outlook for: Fairbanks Metro Area
10. Hydrologic Outlook for: Northern Bristol Bay Coast
11. Hydrologic Outlook for: South Slopes Of The Central Brooks Range; South Slopes of the Western Brooks Range; Noatak Valley; Lower Kobuk Valley; Upper Kobuk Valleys; Lower Koyukuk Valley; Upper Koyukuk Valley
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North America Water Vapor (Moisture)
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Weather Topic: What are Hole Punch Clouds?
Home - Education - Cloud Types - Hole Punch Clouds
Next Topic: Mammatus Clouds
A hole punch cloud is an unusual occurrence when a disk-shaped
hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.
When part of the cloud forms ice crystals, water droplets in the surrounding area
of the cloud evaporate. The effect of this process produces a large elliptical
gap in the cloud. The hole punch cloud formation is rare, but it is not specific
to any geographic area.
Other names which have been used to describe this phenomena include fallstreak hole,
skypunch, and cloud hole.
Next Topic: Mammatus Clouds
Weather Topic: What are Nimbostratus Clouds?
Home - Education - Cloud Types - Nimbostratus Clouds
Next Topic: Precipitation
A nimbostratus cloud is similar to a stratus cloud in its formless,
smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud,
because it is thicker.
Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat
of moderate to heavy precipitation. In some cases, the precipitation may evaporate
before reaching the ground, a phenomenon known as virga.
Next Topic: Precipitation
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